Tooth.



J. J. WATTS.

room.

APPLICATION FILED JULY 26. 1913.

Patented June 27, 1916'.

INVENTOR (/05 W776 A7TORNEY8 WITNESSES JOE JOHNSON WATTS, 0F NATCHEZ,MISSISSIPPI.

TOOTH.

Specification of Letters Patent. Patented June 2'7, 1916.

Application filed July 26, 1913. Serial No. 781,374.

To all whom it may concern:

Be it known that I, J on J OHNSON WATTS, a citizen of the United States,and a resident of Natchez, in the county of Adams and Stateof'Mississippi, have invented certain Improvements in Teeth, of whichthe following is a specification.

My invention is an improvement in teeth, and has for its object theprovision of a tooth comprising a body and a separable backing, the bodyand bacln'ng having interengaging means for attaching the body to thebacking, in order that when the tooth has been once placed, the bodiesmay be interchangeable.

In the drawings :Figure 1 is a perspective view of a tooth and itsbacking connected, Fig. 2 is a similar View with the tooth and backingseparated, Fig. 3 is a perspective view from below and behind of abridge, Fig. l is a similar View, the teeth and the backing being insection, and Fig. 5 is a vertical section of a single tooth.

In the present embodiment of the invention, interchangeable bodies areprovided, which may be supplied in the usual manner by the dental supplyhouses in series or lots, according to color and character.

Each of the said bodies 1 (Figs. 1 and 2) is provided on the endadjacent to the gum with a recess or cut, the said out or recessconsisting of a channel that begins at the inner side of the tooth asshown at 2, passes over the end of the tooth adjacent to the gum asshown at 3 and ends at a point di rectly opposite its beginning. A cut 4is provided leading from the center of the first-named cut, the said out4 extendin on the inner face of the tooth to the level 0 the ends of thefirst-named cut. The backing consists of a stem 5 for engaging the rootcavity, and a head 6 having three claws for engaging the cuts 2, 8, 4:.The arrangement is such that when the head is slipped into place asshown in Fig. 1, the claws 7, 8 and 9 will engage the portions 2, 3, 4of the body, the head 6 engaging the portion 3 of the out.

In placing the improved teeth, the backings are set up with the teeth inposition as to occlusion and base line. The teeth are then removed fromthe backings, leaving the backings in position, and stuck to the gumline with wax. A good investment com-, pound for crown or bridge work isthen poured on to the backing to hold them. Afterward the gum line iscut away, leaving that part of the backing adjacent to the gum exposed,so that gold solder can be flowed into the space that is left betweenthe backings as shown at 10 in Figs. 3 and 4 and on to the abutment. I

WVhether a gold crown is used, or a gold inlay, there will be no gold toshow, and in case of an accident, the tooth body may be removed from thebacking and replaced by another. The three claws engaging the three cutsprevent any change of position in the body of the tooth.

In bridge work, the backing shown in.

Figs. 3 and i are made use of, the stem or spur 5 being omitted, leavingthus a flat surface 11.

I claim A tooth comprising a facing and a separable backing, said facinghaving in its gingiv-al end a recess extending from near the buccal tothe lingual side of the tooth, and leaving a wall between the recess andthe buccal side of the tooth to hide the retoward the incisal end of thetooth, the said branches being three in number, and at the rear of thetooth and at the opposite sides thereof and leaving a portion of thetooth at the sides in front of the branches and hiding the saidbranches, and a backing fitting the recess and having extensionsengaging and fitting the three branches, the walls of the recess and thebranches being approximately parallel to permit the ready removal of thebody.

JOE JOHNSON WATTS. lVitnesses: I I

WILLIAM Donn, HENRY W. GILMORE.

copies of this patent may be obtained for five cents each, by addressingthe Gominiuioner of Patents.

Washington, D. 0.

